Mining machne



Dec. 12, 1933. w. T. McCULLoUGH 1,938,850

MINING MACHINE Original Filed Oct, 25, 1929 2 Sheets-Sheet l 1933- w.'r. MCCULLOUGH 1,938,850

MINING MACHINE Original Filed Oct. 25, 1929 2 Sheets-Sheet 2 PatentedDec. 12, 1933 MINING MACHINE William McCullough,

Chicago, Ill., assigncr to Goodman Manufacturing Company, Chicago, 211.,a corporation of Illinois Application ()ctcber 25, 3.929, Serial No.402,505 Eenewed July 30, 1932 28 Claims;

This invention relates to improvements in miningmachines and has amongother objects to provide a mining machine of the mounted type especiallydesigned for operation in. thin seams of coal for cutting a keri in themine wall along the mine bottom or at various elevations with respectthereto.

A prior application, Serial Number 157,005 filed December 25, 1926,shows a mining machine of the the mine bottom or atvarious elevationswith respect thereto. The machine of my present invention while somewhatsimilar in construction to that ofmy prior invention is an improvement'on'my prior invention in that the parts are so arrangedthat a greaterrange of vertical adjustment of the cutter bar may beobtained in amachine of less vertical dimensions so it may operate in relatively lowcoal seams. 7

Other objects of my invention will appear from time to time thisspecification proceeds.

My invention'may be more readily understood with reference to theaccompanying drawings,

wherein:

Figure 1, is a top plan view of the device embodying my invention withparts broken away and in section to more clearly show the detailsthereof; 7

Figure 2 is an enlarged partial longitudinal fragmentary sectional viewof the device shown in Figure 1; and

Figure is an enlarged partial o longitudinal fragmentary sectional viewof the device shown in Figure 1 with the cutter bar in a differentposition than is shown in Figure 2. 1 Like numerals refer to like partsthroughout the various figures. I,

Referring now in particular to the drawings, the device embodying myinvention. includes a truck 1-0 mounted on truck wheels ll and axles 12.A turntable l3 mounted on the truck 10 and rotated by means of a motor14 on the truck 10 through a suitable s 'stem of gearing of an ordinarytype not herein described nor shown in detail since it is no part of myinvention. Cutting mechanism generally indicated at 15 is trunnioned onthe turntable 13 on a transverse axis near the forward end thereof andis yieldably supported at'its rearward end on said. turntable'foradjusting. the angle of said cuttingmechanism" with respect to themine bottom.

The cutting mechanism 15 includes a motor 16 which is herein preferablyshown as an electric -motor having a cutter frame 1'? extendingforwardly therefrom and projecting beyond. the

track mounted type adapted to out a kerf along boundaries of the truck10. A cutter head 18 is suspended beneath the cutter frame 17 and ismovable vertically'with respect thereto in guides '19, 19. A cutter bar20 projects forwardly from the cutter head 18 and has a cutter chain 21movablethereabout, which cutter chain is driven by the motor 16.

The cutter head 18 includes a supporting memoer h ving relatively widelyspaced vertically extending portions 26 which engage the guides 19, 19and are sliclably movable therealong.

he vertically extending portions 26 of the supporting member 25 haverecesses 28 on the rearward side thereof which have bearing contact onforward and side surfaces of the guides 19, i9. Retaining strips 27, 27abut the rearward sides of the vertically extending portions 26, 26 ofthe supporting member 25 and the guides 19 are fixed to said verticallyextending portions in a suitable manner; as, for .29. Thus thevertically extending portions 26 of the supporting member 25 and theretaining strips 27 have bearing contact with the guides 19 to supportthe supporting member 25 for slidable movement along the guides 19towards and away from the cutter frame 17.

A cutter bar supporting member 33 is vjournaled within the supportingmember 25 for rotatable movement with respect thereto and depends fromsaid supporting member and projects outwardly beyond the boundariesthereof. A retaining ring 35 is attached to the top outer portion of thecutter bar supporting member 33 by means of cap screws 36 and abuts ashoulder 34 of thesupporting member 25 to hold the cutter bar supportingmember 33 from vertical movement with respect thereto so said cutter barsupporting member may rotate about the supporting member 25. Suitablelocking means (not shown) are provided to permit adjustment of thecutter bar v20 about its axis of pivotal connection to the supportingmember 25 and hold said cuter bar supporting member 33 in a stationaryposition'with respect to the supporting member 25 when themachine iscutting a kerf in the mine wall. The cutter bar 2o supported on thecutter bar supporting member 33 in a usual manner not herein shown sinceit is no part of my invention.

The cutter chain 21 is driven from the motor 16 through a suitablegeared reduction drive which includes a motor pinion 37 which mesheswith a spur gear 38 keyed on the rearward end of a longitudinal shaft39. A bevel pinion 40 is keyed on-the forward end of the longitudinalshaft 39 instance, cap screws and meshes with and drives a bevel gear 41journaled on the outer portion of its hub within the cutter frame 17. Avertical splined shaft 42 is engaged by the inner portion of the hub ofthe bevel gear 41 and is driven thereby. The splined shaft 42 is looselymounted within the hub of the bevel gear 41 so as to be verticallymovable therein and so as to have limited axial movement with respectthereto. The splined shaft 42 is held within the hub of the bevel gear41 by means of a cap piece 43 which engages a shoulder 44 on the innerportion of the hub of the bevel gear 41. The cap piece 43 may be held onthe top portion of the splined shaft 42 by any suitable means,

said means herein being preferably shown as a machine screw 45.

A sleeve 46 is journaled within the cutter bar supporting member 33 andis driven by the lower portion of the splined shaft 42. An annular ring42 is fixed within the sleeve 46 and is adapted to abut the lower end ofthe splined shaft 42 and move said shaft vertically upon verticalmovement of said sleeve. The splined shaft 42 is likewise looselymounted within the sleeve 46 so as to be vertically movable therewith orallow said sleeve to be vertically movable with respect thereto and havea limited axial movement with respect thereto to provide for verticaladjustment of the cutter head 18 with respect to the cutter frame 17 andto provide a flexible driving connection between the bevel gear 41 andsleeve 46 to allow for limited transverse movement of the cutter head 18with respect to the cutter frame 17 as the cutter bar 20 is sumped intothe coal. A sprocket 47 is keyed on the lower end of the sleeve 46 andmeshes with and drives the cutter chain 21. A thrust member 48 is fixedon the top portion of the sleeve 46 by any suitable means well known tothe art to hold said sleeve within the cutter bar supporting member 33.It may be seen in looking at Figure 3 that since the splined shaft 42 ismovable in both the hub of the bevel gear 41 and sleeve 46 that the topportion of the splined shaft 42 is beneath the top portion of the motor16 when the cutter bar 20 is in its uppermost cutting position thusproviding a drive for the cutter chain 21 which insures a maximum ofvertical adjustment of the cutter bar 20 and takes up a minimum ofvertical height.

Referring now in particular toanother of the novel features of myinvention which includes a means for moving the cutter head 18 towardsand away from the cutter frame 17, an adjusting screw 50 is provided tosupport the forward end of the supporting member 25 and vertically movesaid supporting member along the guides 19. The adjusting screw 56 isattached to the supporting member 25 at its lower end by means of a pin51 which is fixed to said supporting member and which passes through aneye piece 52 integral with said adjusting screw. The adjusting screw 50is threaded for its entire length and is engaged by a threaded innerportion 53 of a threaded sleeve 55. See Figures 2 and 3. The threadedsleeve 55 is in turn threaded within a hub 56 of a worm gear 57. Theworm gear 57 is journaled on the outer periphery of its hub within thecutter frame 17 and is driven by a worm 58 on the forward end of alongitudinal shaft 59. See Figure 1. A spur gear 60 is fixed on therearward end of the longitudinal shaft 59 and meshes with an idler gear61. The idler gear 61 is in turn driven by a spur gear 62 on a sleeve 63freely mounted on the longitudinal shaft 39. The sleeve 63 isselectively connectible with the longitudinal shaft 39 by suitableclutch means which may be of any type well known to the art but whichherein comprises a cone clutch 64 of an ordinary construction. The coneclutch 64 comprises a member 65 feathered on the longitudinal shaft 39having a face 66 thereon in the form of a frustum of a cone. The face 66is engageable with a corresponding face 67 on the inner periphery of aclutch member 68 integral with the sleeve 63. The member 65 is movablealong the longitudinal shaft 39 to drive the worm gear 5'7 from themotor 16 and thus move the cutter head 18 with respect to the cutterframe 17 by suitable means not herein shown since it is no part of myinvention.

A collar 70 is fixed to the lower portion of the threaded sleeve 55 tostop vertical movement of said sleeve through the worm gear 57 when saidcollar abuts the hub of said worm gear. Thus when the cutter bar 20 isadjacent the mine bottom, as is shown in Figure 1, rotation of the wormgear 57 will move the threaded sleeve 55 upwardly through said wormgear, said threaded sleeve being held from rotation by the reaction ofthe adjusting screw 50, support frame 25, cutter bar supporting means33, and cutter bar 20 thereon. When the collar 70 abuts the hub 56 ofthe worm gear 57, vertical movement of the threaded sleeve 55 will bestopped and said 165 threaded sleeve will rotate with the worm gear 57thus moving the adjusting screw 50 vertically through the threadedsleeve 55 as is illustrated in Figure 3, which adjusting screw isbeneath the top portion of the motor 16 when the cutter bar'20 is in itsuppermost cutting position.

It may thus be seen that I have provided a mining machine of the trackmounted type adapted to out a kerf along the mine bottom or at variouselevations with respect thereto which is provided with means for movingthe cutter bar 20 towards and away from the cutter frame 17, which meansis of a double telescopic construction so as to be beneath the topportion of the motor 16 when the cutter bar 20 is in its 20 uppermostvertical cutting position and which thus requires a minimum of head roomor vertical height. Furthermore, the cutter chain 21 may be driven bythe mining machine motor 16 in all positions of adjustment of the cutter5 bar 20 with respect to the cutter frame 1''! and said driving means isso arranged as to take up a minimum of vertical height and not projectabove the top of the motor 16 when said cutter bar is in its uppermostvertical cutting 30 position, thus providing a maximum of adjustment forthe cutter bar 20 which requires a minimum of vertical height.

Although I' have herein shown and described one form in which myinvention may be embodied, it will be understood that the constructionthereof and arrangement of the various parts may be altered withoutdeparting from the spirit and scope thereof. Furthermore, I do not wishto be construed as limiting myself to the specific embodimentillustrated in the drawings, excepting as it may be limited by theappended claims.

I claim as my invention:

1. In a track mounted mining machine, a truck, a cutting element on saidtruck including a motor having a cutter frame projecting forwardlytherefrom beyond the boundaries of said truck, a pair of parallel spacedguides depending from said cutter frame, a cutter head engageable withand movable along said guides towards andaway from said cutter frame ina plurality of parallel planes, and means for moving said cutter headtowards and awayfrom said cutter frame comprising a telescopicadjustingscrew interposed between said cutter frame and said cutterhead, including a driving member, a sleeve threaded within said drivingmember, and an adjusting screw threaded within said sleeve.

2. In a track mounted mining machine, a truck, a cutting element on saidtruck including a motor having a cutter frame projecting forwardlytherefrom beyond the boundaries of said truck, a pair of parallel spacedguides depending from said cutter frame, a cutter head engageable withand movable along said'guides towards and away fromsaid cutter frame ina plurality of parallel planes-andmeans for moving said cutter headtowards and away from said cutter frame comprising a telescopicadjusting screw interposed between said cutter frame and said cutterhead, including a driving member, a sleeve threaded within said drivingmember, and an adjusting screw threaded within said sleeve, and meansfor selectively connecting saiddriving member to said motor.

3. In a track mounted mining machine, a truck; a cutting'element "onsaid truck including a motor havlng'a cutter frame projecting forwardlytherefrom beyond the boundaries of said truck, a pair of parallel spacedguides depending from said cutter frame, a cutter head engageable withand movable 'alongsaid guides towards and away' from said cutter framein a plurality of parallel planes, and means for moving said outter headtowards and away from said'cutter frame comprising a telescopicadjusting screw interposed between said cutter frame and said cutterhead, including a driving member journaled in said cutter frame, asleeve threaded within said driving member, an adjusting screw threadedwithin said sleeve, and means for connecting said adjusting screw withsaid cutter head.

4. In a track mounted mining machine, a truck, a cutting element on saidtruck including a motor having a cutter frame projectingforwardly'th'erefrom beyond the boundaries of said truck, a pair ofparallel spaced guides depending from said cutter frame,. a cutter headengageable with and movable along said guides towards and away from saidcutter frame in a plurality of parallel planes, and means for movingsaid cutter head towards and away from said cutter frame comprising atelescopic adjusting screw interposed between said cutter frame and saidcutter head including a worm, a sleeve threaded within :said worn, andan adjusting 'screw threaded within said sleeve.

5. In a track mounted mining machine, a truck, a. cuttingelem'enton'said truck including a motor having a cutter frame projectingforwardly therefrom beyond the boundaries of said truck, a pair ofparallel spaced guides depending from'said cutter frame, a cufter headengageable with and movable along said guides towards and away from saidcutter frame in a plurality of parallel planes, andmeans for moving saidcutter head towards and away from said cutter frame comprising atelescopic adjusting screw interposed between said cutter frame and saidcutter head including a worm, a sleeve threaded within said worm, and anadjusting screw threaded within said sleeve, and means for selectivelycormecting said worm to sald motor.

6; In a track mounted mining machine, a'tru'ck,

a cutting element on said truck 'includinga motor having a cutter frameprojecting forwardly therefrom beyond the boundaries of said truck, apair of parallel spaced guides depending from said cutter framepacutterhead engageable with and movable along said guides towards and awayfromsaid cutter frame in a plurality of parallel planes, and means formoving said cutter head towards and away from the said cutter framecomprising a telescopic adjustingscrew interposed betweensaid cutterframe and said cutter head including a worm journaled in said cutterframe, means for selectively connecting saidworm to said motor, a sleevethreaded within said worm, an adjusting screw threaded within saidsleeve, and means for connecting said adjusting screw 'wlthsaid' cutterhead.

i '7. In a track-mounted mining machine, a truck, a cutti'ngelement onsaid truck including a motor having a cuter frame projecting forwardlytherefrom beyond the boundaries of said truck, a pair of parallel spacedguides depending from said cutter frame, a cutter head engageable withand movable along-said guides towards and away from said cutter frame ina plurality of parallel planes, having a cutter bar projecting forwardlytherefrom and a cutter chain movable thereabout, means for driving saidcutter chain about said cutter bar fromsaid motor including a bevel gearon said outer frame, a sprocket on said cutter head, means forconnecting said sprocket with said bevel-gear in all positionsofsaidcutter head with respect to said cutter frame comprising a spline'dshaft, said connection between said bevel gear and said sprocketbeing'so arranged that the top portion of said shaft is beneath the topporiion of said motor when said cutter head is in its uppermosu cuttingposition, and means for moving said cutter head towards and awayfromsaid cutter framecomprising a telescopic adjusting screw interposedbeiween said cutter frame and said cutter head, said telescopicadjusting screw being so arranged that the top portion of'said screw isbeneath the upper extremities of said motor when-said cutter head is inits uppermost cutting position.

8. In a'track mounted mining machine, atruck, a cutting element on saidtruck including a motor having a cutter frame projecting forwardlytherefrom-beyond the boundaries of said truck, a pair of parallel spacedguides depending from said cutier frame, a cutter head engagea'ble'withand movable along said guides towards and away fromsaid cutter frame ina plurality of parallel planes having a cutter bar projecting'forwardlytherefrom and having a cutter chain movable thereabout, means for movingsaid cutter head towards and away'from said cutter frame comprising atelescopic adjusting screw interposed between said cutter frame and saidcutter head,

means for driving said telescopic adjustingscrew j from said motor, andmeans for driving said'cutter chain from said motor comprising asprocket, a bevel gear, and a splined shaft of uniform diameter movablevertically with respect to said bevel gear and said sprocket for drivingsaid sprocket from said bevel gear in' all vertical posiiions ofadjustment of said sprocket with respect to said bevel gear.

9, In a track mounted mining machine, a truck, a cutting element on saidtruck including a motor having a cutter frame projectingforwardlytherefrom beyond ihe boundaries of said truck, a pair ofparallel spaced guides depending from said cutter frame; a cutter headengageable with and movable along saidguides towards and away from saidcutter frame in a plurality of parallel planes having a cutter barprojecting forwardly therefrom and having a cutter chain movablethereabout, means for moving said cutter head towards and away from saidcutterframe comprising a telescopic adjusting screw interposed betweensaid cutter frame and said cutter head, means for driving saidtelescopic adjusting screw from said motor, and means for driving saidoutter chain from said motor intermediate said telescopic adjustingscrew and said parallel spaced guides comprising a sprocket, a bevelgear, a splined shaft of uniform diameter loosely engaging said bevelgear and said sprocket and movable vertically with respect to said bevelgear for driving said sprocket from said bevel gear in all verticalpositions of adjustment of said sprocket with respect to said bevelgear, means for holding said splined shaft from vertical movementwithrespect to said bevel gear and means for vertically moving said splinedshaft upon vertical movement of said sprocket.

10. In a track mounted mining machine, a truck, a cutting element onsaid truck including a motor having a cutter frame projecting forwardlytherefrom beyond the boundaries of said truck, a pair of parallel spacedguides depending from said cutter frame, a cutter head engageable withand movable along said guides towards and away from said cutter frame ina plurality of parallel planes having a cutter bar projecting forwardlytherefrom and having a cutter chain movable thereabout, means for movingsaid cutter head towards and away from said cutter frame comprising atelescopic adjusting screw interposed between said cutter frame and saidcutter head, means for driving said telescopic adjusting screw fromsaidmotor, and means for driving said cutter chain from said motorintermediate said telescopic adjusting screw and said parallel spacedguides comprising a sprocket, a bevel gear, a splined shaft of uniformdiameter loosely engaging said bevel gear and said sprocket and movablevertically with respect to said bevel gear for driving said sprocketfrom said bevel gear in all vertical positions of adjustment of saidsprocket with respect to said bevel gear, means for holding said splinedshaft from vertical movement with respect to said bevel gear and meansfor vertically moving said splined shaft upon vertical movement of saidsprocket, comprising means on the top portion of said splined shaftengageable with the inner surface of said bevel gear, and meansassociated with said sprocket engageable with the lower portion of saidtransverse shaft.

11. In a' track mounted mining machine, a truck, a cutting element onsaid truck including a motor having a cutter frame projecting forwardlytherefrom beyond the boundaries of said truck, a pair of parallel spacedguides depending from said cutter frame, a cutter head engageable withand movable along said guides towards and away from said cutter frame ina plurality of parallel planes having a cutter bar projecting forwardlytherefrom and having a cutter chain movable thereabout, means for movingsaid cutter head towards and away from said cutter frame comprising atelescopic adjusting screw interposed between said cutter frame and saidcutter head, means for driving said telescopic adjusting screw from saidmotor, and means for driving said cutter chain from said motorcomprising a sprocket, a bevelgear, a splined shaft of uniform diameterloosely engaging said bevel gear and said sprocket and movablevertically with respect tosaid bevel gear for driving said sprocket fromsaid bevel gear in all vertical positions of adjustment of said sprocketwith respect to said bevel gear, means for holding said splined shaftfrom vertical movement with respect to said bevel gear and means forvertically moving said splined shaft upon vertical movement of saidsprocket, comprising a cap piece on the top portion of said splinedshaft engageable with the inner surface of said bevel gear, and anannular ring associated with said sprocket engageable with the lowerportion of said transverse shaft.

12. In a track mounted mining machine, a truck, a cutting element onsaid truck including a motor having a cutter frame projecting forwardlytherefrom and extending beyond the boundaries of said truck, a pluralityof spaced guides extending from said cutter frame, a cutter headhaving'a cutter bar extending forward ly therefrom having a cutter chainmovable thereabout engageable with and movable in said guides towardsand away from said'cutter frame in a plurality of parallel planes, meansfer'driving said cutter chain from said motor, and means driven fromsaid motor for moving said cutter head towards and away from said cutterframe comprising an extensible member interposed between said cutterframe and said cutter head forwardly of said means for driving saidcutter chain from said motor, said extensible member being so arrangedthat its top portion is beneath the upper extremities of said motor andcutter frame when said cutter head is in its uppermost cutting position.

13. In a track mounted mining machine, a truck, a cutting element onsaid truck including a motor having a cutter frame projecting forwardlytherefrom and extending beyond the boundaries of said truck, a pluralityof spaced guides extending from said cutter frame, a cutter headengageable with and movable in said guides towards and away from saidcutter frame in a plurality of parallel planes having .a cutter barextending forwardly therefrom, said cutter bar. having a cutter chainmovable thereabout, means for driving said cutter chain from said motorincluding a splined shaft movable with said cutter head upon movement ofsaid cutter head towards and away from said cutter frame, and meansdriven from said motor for moving said cutter head in said guidestowards and away from said cutter frame comprising an extensible memberhaving connection with said cutter frame and said cutter head disposedforwardly of said splined shaft, said extensible member and said splinedshaft being so arranged that their upper extremities are beneath theupper extremities of said motor and cutter frame when said cutter headis in its uppermost cutting position.

14. In a track mounted mining machine, a truck, a cutting element onsaid truck including a motor having a cutter frame projecting forwardlytherefrom and extending beyond the boundaries of said truck, a pluralityof spaced guides extending from said cutter frame, a cutter headengageable with and movable in said guides towards and away from saidcutter frame in a plurality of parallel planes having a cutter barextending forwardly therefrom, said cutter bar having a cutter chainmovable thereabout, means for driving said cutter chain from said motorincluding a splined shaft movable with said cutter-head, upon movementof said cutter head toward and away from said cutter-frame, and meansdriving from said motor for moving said cutter head in said guidestowards and away from said cutter frame comprising a threaded memberdisposed forwardly of said vertically movable splined shaft having fixedconnection with said cutter head and movable connection with saidcutter, frame,.,said threaded member and said splined shaft being soarranged that their upper extremities are beneath the upper extremitiesof said motor and cutter frame when said cutter head is in its uppermostcutting position.

15. In a mining machine, a support, a cutting element on said supportincluding a motor havinga cutter frame projecting forwardly therefrombeyond, the boundaries of said supporua par parallel spaced guidesextending from said outter frame, a cutter head engageable with andmovable along said guides towards and away from said cutter frame in aplurality of parallel planeaand means for moving said cutter headtowards and away from' said cutter frame comprising a double telescopicadjusting screw interposed between said cutter frame and said outterhead.

16. In a mining machine, a support, a cutting element on said supportincluding a motor having a cutter frame projecting forwardly therefrom1' beyond the boundaries of said support, a pair of parallel spacedguides extending from said cutter frame, a cutter head engage'able withand movable along said guides towards and away from said cutter frame ina plurality of parallel planes,

and means for moving said cutter head towards and away fromsaid cutterframe comprising a double telescopic adjusting. screw interposed betweensaid cutter frame and said cutter head ineluding a threaded memberdriven by said motor,

a threaded sleeve threaded within said threaded member and a threadedmember threaded within said, threaded sleeve.

17. In a mining machine, a support, a cutting element on said supportincluding a motor having a cutter frame projecting forwardly therefrombeyond the boundaries of said support, a pair of parallel spaced guidesextending from said cutter frame, a cutter head engagcable with andmovable alongv said guides'towards and away from said cutter frame in aplurality of parallel planes, and'means for moving said cutter headtowards: and away from saidcutter frame comprising a double telescopicadjusting screw disposedforwardly of said guides and interposed betweensaid cutter frame and said cutter head.

18,. In a mining machine, a support, a cutting element on'said supportincluding a motor having a cutter frame projectingforwardly therefrombeyond the boundaries of said support, a

- pair of parallel spaced guides extending from said cutter frame, acutter head engageable with and movable along, said guides towards andaway from said cutter frame in a plurality of parallel planes, a cutterbar extending from said cutter head having a cutter chain movablethereabout, means interposed between said cutter frame and cutter head.

19. In a mining machine, a support, a cutting element on said supportincluding a motor haysaid cutter frame compr? ing a cutter frameprojecting forwardly therefrom beyond the boundaries of said support, apair of parallel spaced guides extending from said cutter frame, acutter head engageable with and movabb along said guides towards andaway from said cutter frame in a plurality of parallel pianos, a cutterbar extending from said cutter head having a cutter chain movablethereabout, means for driving said cutter chain from said motorincluding a shaft having a sprocket driven thereby means for moving saidcutter head towards and away from said cutter frame comprising a doubletelescopic adjusting screw disposed forwardly of said cutter chain driveshaft and interposed between said cutter frame and said cutter headincluding a threaded member driven by J motor, a threaded sleevethreaded .vl .1 sreadied member and a threaded member threaded withinsaid threaded sleeve.

20. In a mining machine, a support, a cutting element on said supportincluding a cutter frame extending beyond the boundaries of saidsupport, a plurality of spaced extending from said cutter frame, acutter head having a cutter bar extending forwardly therefrom movable insaid guides towards and away from said cutter frame in a plurality ofparallel planes, a cutter chain movable about said cutter bar, drivemeans for said out er chain including a cutter chain sprockct and ashaft coaxial therewith, and means for moving cutter head towards andaway from her interposed between said cutter frame and said cutter headforwardly of said shaft for driving said cutter chain, said extensiblemember being so arranged that its top portion is beneath the upperextremities of said cutter frame when said cutter head and cutter bar isin its uppermost cutting position.

21. In a mining machine, a support, a cutting element on said supportincluding a cutter frame extending beyond the'boundaries of saidsupport, a plurality of spaced guides extending from said cutter frame,a cutter head having a cutter bar extending forwardly therefrom movablein said guides towards and awayfrom said cutter frame in a plurality ofparallel planes, a cutter chain movable about said cutter bar, drivemeans for cutter chain including a cutter chain sprockst and a shaftcoaxial therewith, said shaft being movable with cutter head uponmovement of said cutter head towards and away from said cutter frame,and means for moving said cutter head in said guides towards and awayfrom said cutter frame comprising an extensible member having connectionith said cutter frame and cutter head and disposed forwardly ofsaidshaft, said extensible member and said shaft being so rranged thattheir upper extremities are beneath the upper extremities of said cutterframe when said cutter head is in its uppermost cutting position.

22. In a mining machine, a support, a cutting element on said supportincluding a cutter frame extending beyond the boundaries of saidsupport, a plurality of spaced guides extending from said cutter frame,a cutter head having a projecting cutter bar movable in said guidestowards and away from said cutter frame in a plurality of parallelguides, a cutter chain movable about said cutter bar, drive means forsaid cutter chain including a cutter chain sprocket and a shaft coaxialtherewith, said shaft being movable with said cutter head upon movementof said cutter head towards and away from said cutter frame,

an extensible memand means for moving said cutter head in said guidestowards and away from said cutter frame comprising a power operateddouble telescopic adjusting screw having connection with said outterframe and cutter head and disposed forwardly of said shaft, poweroperated double telescopic adjusting screw and said shaft being sarranged that their uppe" extremities are beneath the upper extremitiesof said cutter frame when said cutter head is in its uppermost cuttingposition.

23. In a track mounted mining mach truck, a cutting element on saidtruck including a motor having a cutter frame projec ing for wardlytherefrom beyond the boundaries of said truck, a pair of parallel spacedguides extending from said cutter frame, a cutter head engageable withand movable along said guides towards and away from said cutter frame ina plurality of parallel planes, and means for moving said cutter headtowards and away from said cutter frame comprising a double telescopicadjusting screw interposed between said cutter frame and said cutterhead.

24. In a track mounted mining machine, a truck, a cutting element onsaid truck including a motor having a cutter frame projecting f wardlytherefrom beyond the boundaries of said truck, a pair of parallel spacedguides'extending from said cutter frame, a cutter head engageable withand movable along said guides towards and away from said cutter fra nein a plurality of parallei planes, and means for moving said cutter headtowards and away from said cutter frame comprising a double telescopicadjusting; screw be, a

interposed between said cutter frame and said cutter head, and a driveconnection for driving said double telescopic adjusting screw from saidmotor and translationally moving said adjusting screw.

25. In a track mounted mining machine, a truck, a cutting element onsaid truck including a motor having a cutter frame projecting forwardlytherefrom beyond the boundaries of said truck, a pair of parallel spacedguides extending from said cutter frame, a cutter head engageable withand movable along said guides towards and away from said cutter frame ina plurality of parallel planes, means for moving said cutter headtowards and away from said outter frame comprisin a double telescopicadjusting screw interposed between said cutter frame and said cutterhead, said double telescopic adjusting screw being so arranged that thetop portion of said screw is beneath the upper er.- tremities of saidmotor when said cutter head is in its uppermost cutting position.

26.1n a track mounted mining machine, a truck, a cutting element on saidtruck including a motor having a cutter frame proiecting forwardlytherefrom beyond the boundaries of said truck, a plurality of parallelspaced guides extending from said cutter frame, a cutter head engageablewith and movable along said guides towards and away from said cutterframe in a plurality of parallel planes, said cutter head having acutter bar projecting forwardly therefrom and having a. cutter chainmovable thereabout, means for moving said cutter head towards and awayfrom said cutter frame comprising a double telescopic adjusting screwinterposed between said cutter frame and said cutter head, means fordriving said double telescopic adjusting screw from said motor, andseparate means for driving said cutter chain from said motor comprisinga sprocket, a bevel gear, and a splined shaft disposed intermediate saiddouble telescopic adjusting screw and said parallel spaced guidesengageable with said sprocket and bevel gear and vertically movable withsaid sprocket for driving said sprocket from said bevel gear in allpositions of adjustment of said sprocket with respect to said bevelgear.

27. In a track. mounted mining machine, a truck, a cutting element onsaid truck including a motor having a cutter frame projecting forwardlytherefrom beyond the boundaries of said truck, a pair of parallel spacedguides extending from said cutter frame, a cutter head engageable withand movable towards and away from said cutter frame in a plurality ofparallel planes, said cutter head having a forwardly projecting cutterbar having a cutter chain movable thereabout, cutter chain driving meanscomprising a cutter chain sprocket, vertical shaft for driving saidcutter chain sprocket disposed forwardly of said parallel spaced guides,and means for moving said cutter head towards and away from said cutterframe comprising a double telescopic adjusting screw disposed forwardlyof said vertical shaft on an axis extending longitudinally of saidcutter frame and interposed between said cutter frame and said cutterhead.

28. In a traclr mounted mining machine, atruck, a cutting element onsaid truck including a motor having a cutter frame projecting forwardlytherefrom beyond the boundaries of said truclr, a pair of parallelspaced guides extending from said cutter frame, a cutter head engageablewith and movable towards and away from said cutter frame in a pluralityof parallel planes, said cutter head having a forwardly projectingcutter bar having a cutter chain movable thereabout, cutter chaindriving means comprising a cutter chain sprocket, a bevel gear on saidcutter frame and driven by said motor, a splined vertical shaft slidablyconnectible with said bevel gear and sprocket and disposed forwardly ofsaid parallel spaced guides, and means for moving said cutter headtowards'and away from said cutter frame comprising a double telescopicadjusting screw 7 having operative connection with said cutter frame andsaid cutter head.

WILLIAM T. MoCULLOUGH.

